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Did you edit the affected pictures using Photoshop by chance? The problem could be that the
images have a CMYK color mode attached to them which is not web
friendly. You can reset your color mode to RGB-16bit and you
will then be able to upload them and view them on your site. An easy
way to do this is instead of just selecting "save", choose "save for
web" in Photoshop. The image will then be automatically saved in the
correct format.